One of the most spoken about religious phenomena of the 90's in Portugal was an emergent church or sect that originated
in Brazil and quickly was implanted in Portugal.
The church was (is?) called Igreja Universal do Reino de Deus (IURD), which
translates into God's Kingdom Universal Church, a protestant group with a kind of
histrionic preaching involving miracles, and trances. That was part of its appeal but
it also came to the news when one of its bishops destroyed in front of the Brazilian TV cameras an image of
the Holy Mary by kicking it, punching it,
jumping on it, etc., in an attack against idolatry. After that, the church went into
media oblivion, and I don't know if it
still exists or not.

The IURD displayed a flag in
a prominent fashion: white with a large red heart charged with a white
stylized dove, centered. Both symbols are deeply rooted in the Christian
tradition and their symbolism is clear enough (purity, love of and for God,
peace, etc.). I don't know how official this flag was, but I saw it many
times in TV reports of IURD activities, so I gather it was pretty much
official. The flag looked like 2:3 in proportions. The symbol appeared also
in IURD publications, sometimes over the initials IURD in black gothic
capitals.
I have no idea if it spread to other countries or stayed a lusophonous
phenomenon.